Anaerobic Storage and Conversion of Microalgal Biomass to Manage Seasonal Variation in Cultivation

Wendt, Lynn M.; Whalen, Bradley D.; Knoshaug, Eric P.; Nagle, Nicholas J.; Dong, Tao; Spiller, Ryan; Panczak, Bonnie; Van Wychen, Stefanie; Dempster, Thomas A.; Gerken, Henri; Pienkos, Philip T.

doi:10.1021/acssuschemeng.0c03790

Title: Anaerobic Storage and Conversion of Microalgal Biomass to Manage Seasonal Variation in Cultivation

Journal Article · Fri Jul 31 00:00:00 EDT 2020 · ACS Sustainable Chemistry & Engineering

DOI:https://doi.org/10.1021/acssuschemeng.0c03790· OSTI ID:1726071

^[1];

^[2]; Nagle, Nicholas J. ^[2];

^[2]; Spiller, Ryan ^[2]; Panczak, Bonnie ^[2]; Van Wychen, Stefanie ^[2]; Dempster, Thomas A. ^[3]; Gerken, Henri ^[4]; Pienkos, Philip T. ^[2]

Idaho National Lab. (INL), Idaho Falls, ID (United States)
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Santa Fe Community College, Santa Fe, NM (United States)
Arizona State Univ., Mesa, AZ (United States)

Seasonal variation in microalgal biomass production is a well-known challenge when optimizing economics for algal fuel conversion, especially given the fluctuation in biomass production between winter and summer. Wet storage offers significant potential for cost and energy savings compared to dewatering and dry storage. This study demonstrates the feasibility of preserving harvested Scenedesmus acutus biomass through wet anaerobic storage for use in biochemical conversion. Anaerobic storage effectively preserved biomass with minimal degradation of carbohydrates and preservation of lipids and proteins. Screening experiments identified optimal pretreatment conditions for stored biomass. Scale-up of pretreatment enabled fermentation of the hydrolysate to butyric acid and indicated no observable difference in conversion between unstored and stored biomass. Lipid extraction improved by a relative 12% for stored biomass. These results suggest that wet anaerobic storage can effectively manage seasonal variation in biomass production and is compatible with biochemical approaches for biofuel production.

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Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1726071

Report Number(s):: NREL/JA-2700-77686; MainId:30601; UUID:32a0c3a1-f4c5-4971-b1fa-98ec15923e17; MainAdminID:18901

Journal Information:: ACS Sustainable Chemistry & Engineering, Vol. 8, Issue 35; ISSN 2168-0485

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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